﻿using HtmlAgilityPack;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;

namespace SIG.Infrastructure.Helper
{
    /// <summary>
    /// 远程文件抓取类
    /// </summary>
    public class DataAcquisition
    {

        /// <summary>
        /// 返回链接列表
        /// </summary>
        /// <param name="file"></param>
        /// <returns></returns>
        public static List<LinkItem> Find(string file)
        {
            List<LinkItem> list = new List<LinkItem>();
            // 1.
            // Find all matches in file.
            MatchCollection m1 = Regex.Matches(file, @"(<a.*?>.*?</a>)", RegexOptions.Singleline);

            // 2.
            // Loop over each match.
            foreach (Match m in m1)
            {
                string value = m.Groups[1].Value;
                LinkItem i = new LinkItem();

                // 3.
                // Get href attribute.
                Match m2 = Regex.Match(value, @"href=\""(.*?)\""", RegexOptions.Singleline);
                if (m2.Success)
                {
                    i.Href = m2.Groups[1].Value;
                }

                // 4.
                // Remove inner tags from text.
                string t = Regex.Replace(value, @"\s*<.*?>\s*", "", RegexOptions.Singleline);
                i.Text = t;

                list.Add(i);
            }
            return list;
        }



        #region 日期随机函数
        /**********************************
         * 函数名称:DateRndName
         * 功能说明:日期随机函数
         * 参    数:ra:随机数
         * 调用示例:
         *          GetRemoteObj o = new GetRemoteObj();
         *          Random ra = new Random();
         *          string s = o.DateRndName(ra);
         *          Response.Write(s);
         *          o.Dispose();
         * ********************************/
        /// <summary>
        /// 日期随机函数
        /// </summary>
        /// <param name="ra">随机数</param>
        /// <returns></returns>
        public static string DateRndName(Random ra)
        {
            DateTime d = DateTime.Now;
            string s = null, y, m, dd, h, mm, ss;
            y = d.Year.ToString();
            m = d.Month.ToString();
            if (m.Length < 2) m = "0" + m;
            dd = d.Day.ToString();
            if (dd.Length < 2) dd = "0" + dd;
            h = d.Hour.ToString();
            if (h.Length < 2) h = "0" + h;
            mm = d.Minute.ToString();
            if (mm.Length < 2) mm = "0" + mm;
            ss = d.Second.ToString();
            if (ss.Length < 2) ss = "0" + ss;
            s += y + m + dd + h + mm + ss;
            s += ra.Next(100, 999).ToString();
            return s;
        }
        #endregion

        #region 取得文件后缀
        /**********************************
         * 函数名称:GetFileExtends
         * 功能说明:取得文件后缀
         * 参    数:filename:文件名称
         * 调用示例:
         *          GetRemoteObj o = new GetRemoteObj();
         *          string url = @"http://www.baidu.com/img/logo.gif";
         *          string s = o.GetFileExtends(url);
         *          Response.Write(s);
         *          o.Dispose();
         * ********************************/
        /// <summary>
        /// 取得文件后缀
        /// </summary>
        /// <param name="filename">文件名称</param>
        /// <returns></returns>
        public static string GetFileExtends(string filename)
        {
            string ext = null;
            if (filename.IndexOf('.') > 0)
            {
                string[] fs = filename.Split('.');
                ext = fs[fs.Length - 1];
            }
            return ext;
        }
        #endregion

        #region 获取远程文件源代码
        /**********************************
         * 函数名称:GetRemoteHtmlCode
         * 功能说明:获取远程文件源代码
         * 参    数:Url:远程url
         * 调用示例:
         *          GetRemoteObj o = new GetRemoteObj();
         *          string url = @"http://www.baidu.com/";
         *          string s = o.GetRemoteHtmlCode(url);
         *          Response.Write(s);
         *          o.Dispose();
         * ********************************/
        /// <summary>
        /// 获取远程文件源代码
        /// </summary>
        /// <param name="url">远程url</param>
        /// <returns></returns>
        public static string GetRemoteHtmlCode(string url, Encoding encoding)
        {
            WebClient web = new WebClient();
            byte[] buffer = web.DownloadData(url);
            //string pageHtml = Encoding.Default.GetString(pageData);  //如果获取网站页面采用的是GB2312，则使用这句          
            //string pageHtml = Encoding.UTF8.GetString(pageData); //如果获取网站页面采用的是UTF-8
            return encoding.GetString(buffer);
        }

        #endregion

        #region 保存远程文件
        /**********************************
         * 函数名称：RemoteSave
         * 功能说明：保存远程文件
         * 参    数：Url:远程url;Path:保存到的路径
         * 调用示例:
         *          GetRemoteObj o = new GetRemoteObj();
         *          string s = "";
         *          string url = @"http://www.baidu.com/img/logo.gif";
         *          string path =Server.MapPath("Html/");
         *          s = o.RemoteSave(url,path);
         *          Response.Write(s);
         *          o.Dispose();         
         * ******************************/
        /// <summary>
        /// 保存远程文件
        /// </summary>
        /// <param name="Url">远程url</param>
        /// <param name="Path">保存到的路径</param>
        /// <returns></returns>
        //public string RemoteSave(string Url, string Path)
        //{
        //    Random ra = new Random();
        //    string StringFileName = DateRndName(ra) + "." + GetFileExtends(Url);
        //    string StringFilePath = Path + StringFileName;

        //    MSXML2.XMLHTTP _xmlhttp = new MSXML2.XMLHTTPClass();
        //    _xmlhttp.open("GET", Url, false, null, null);
        //    _xmlhttp.send("");
        //    if (_xmlhttp.readyState == 4)
        //    {
        //        if (System.IO.File.Exists(StringFilePath))
        //            System.IO.File.Delete(StringFilePath);
        //        System.IO.FileStream fs = new System.IO.FileStream(StringFilePath, System.IO.FileMode.CreateNew);
        //        System.IO.BinaryWriter w = new System.IO.BinaryWriter(fs);
        //        w.Write((byte[])_xmlhttp.responseBody);
        //        w.Close();
        //        fs.Close();
        //    }
        //    else
        //        throw new Exception(_xmlhttp.statusText);
        //    return StringFileName;
        //}
        #endregion

        #region 替换网页中的换行和引号
        /**********************************
         * 函数名称:ReplaceEnter
         * 功能说明:替换网页中的换行和引号
         * 参    数:HtmlCode:html源代码
         * 调用示例:
         *          GetRemoteObj o = new GetRemoteObj();
         *          string Url = @"http://www.baidu.com/";
         *          strion HtmlCode = o.GetRemoteHtmlCode(Url);
         *          string s = o.ReplaceEnter(HtmlCode);
         *          Response.Write(s);
         *          o.Dispose();
         * ********************************/
        /// <summary>
        /// 替换网页中的换行和引号
        /// </summary>
        /// <param name="HtmlCode">HTML源代码</param>
        /// <returns></returns>
        public static string ReplaceEnter(string HtmlCode)
        {
            string s = "";
            if (HtmlCode == null || HtmlCode == "")
                s = "";
            else
                s = HtmlCode.Replace("\"", "");
            s = s.Replace("\r\n", "");
            return s;
        }

        #endregion              

        #region 执行正则提取出值
        /**********************************
         * 函数名称:GetRegValue
         * 功能说明:执行正则提取出值
         * 参    数:HtmlCode:html源代码
         * 调用示例:
         *          GetRemoteObj o = new GetRemoteObj();
         *          string Url = @"http://www.baidu.com/";
         *          strion HtmlCode = o.GetRemoteHtmlCode(Url);
         *          string s = o.ReplaceEnter(HtmlCode);
         *          string Reg="<title>.+?</title>";
         *          string GetValue=o.GetRegValue(Reg,HtmlCode)
         *          Response.Write(GetValue);
         *          o.Dispose();
         * ********************************/
        /// <summary>
        /// 执行正则提取出值
        /// </summary>
        /// <param name="RegexString">正则表达式</param>
        /// <param name="RemoteStr">HtmlCode源代码</param>
        /// <returns></returns>
        public static string GetRegValue(string RegexString, string RemoteStr)
        {
            string MatchVale = "";
            Regex r = new Regex(RegexString);
            Match m = r.Match(RemoteStr);
            if (m.Success)
            {
                MatchVale = m.Value;
            }
            return MatchVale;
        }
        #endregion       

        #region 替换HTML源代码
        /**********************************
         * 函数名称:RemoveHTML
         * 功能说明:替换HTML源代码
         * 参    数:HtmlCode:html源代码
         * 调用示例:
         *          GetRemoteObj o = new GetRemoteObj();
         *          string Url = @"http://www.baidu.com/";
         *          strion HtmlCode = o.GetRemoteHtmlCode(Url);
         *          string s = o.ReplaceEnter(HtmlCode);
         *          string Reg="<title>.+?</title>";
         *          string GetValue=o.GetRegValue(Reg,HtmlCode)
         *          Response.Write(GetValue);
         *          o.Dispose();
         * ********************************/
        /// <summary>
        /// 替换HTML源代码
        /// </summary>
        /// <param name="HtmlCode">html源代码</param>
        /// <returns></returns>
        public static string RemoveHTML(string HtmlCode)
        {
            string MatchVale = HtmlCode;
            foreach (Match s in Regex.Matches(HtmlCode, "<.+?>"))
            {
                MatchVale = MatchVale.Replace(s.Value, "");
            }
            return MatchVale;
        }

        #endregion

        #region 匹配页面的链接
        /**********************************
         * 函数名称:GetHref
         * 功能说明:匹配页面的链接
         * 参    数:HtmlCode:html源代码
         * 调用示例:
         *          GetRemoteObj o = new GetRemoteObj();
         *          string Url = @"http://www.baidu.com/";
         *          strion HtmlCode = o.GetRemoteHtmlCode(Url);
         *          string s = o.GetHref(HtmlCode);
         *          Response.Write(s);
         *          o.Dispose();
         * ********************************/
        /// <summary>
        /// 获取页面的链接正则
        /// </summary>
        /// <param name="HtmlCode"></param>
        /// <returns></returns>
        public static string GetHref(string HtmlCode)
        {
            string MatchVale = "";
            string Reg = @"(h|H)(r|R)(e|E)(f|F) *= *('|"")?((\w|\\|\/|\.|:|-|_)+)('|""| *|>)?";
            foreach (Match m in Regex.Matches(HtmlCode, Reg))
            {
                MatchVale += (m.Value).ToLower().Replace("href=", "").Trim() + "||";
            }
            return MatchVale;
        }
        #endregion

        #region 匹配页面的图片地址
        /**********************************
         * 函数名称:GetImgSrc
         * 功能说明:匹配页面的图片地址
         * 参    数:HtmlCode:html源代码;imgHttp:要补充的http.当比如:<img src="bb/x.gif">则要补充http://www.baidu.com/,当包含http信息时,则可以为空
         * 调用示例:
         *          GetRemoteObj o = new GetRemoteObj();
         *          string Url = @"http://www.baidu.com/";
         *          strion HtmlCode = o.GetRemoteHtmlCode(Url);
         *          string s = o.GetImgSrc(HtmlCode,"http://www.baidu.com/");
         *          Response.Write(s);
         *          o.Dispose();
         * ********************************/
        /// <summary>
        /// 匹配页面的图片地址
        /// </summary>
        /// <param name="HtmlCode"></param>
        /// <param name="imgHttp">要补充的http://路径信息</param>
        /// <returns></returns>
        public static string GetImgSrc(string HtmlCode, string imgHttp)
        {
            string MatchVale = "";
            string Reg = @"<img.+?>";
            foreach (Match m in Regex.Matches(HtmlCode, Reg))
            {
                MatchVale += GetImg((m.Value).ToLower().Trim(), imgHttp) + "||";
            }
            return MatchVale;
        }
        /// <summary>
        /// 匹配<img src="" />中的图片路径实际链接
        /// </summary>
        /// <param name="ImgString"><img src="" />字符串</param>
        /// <returns></returns>
        public static string GetImg(string ImgString, string imgHttp)
        {
            string MatchVale = "";
            string Reg = @"src=.+\.(bmp|jpg|gif|png|)";
            foreach (Match m in Regex.Matches(ImgString.ToLower(), Reg))
            {
                MatchVale += (m.Value).ToLower().Trim().Replace("src=", "");
            }
            return (imgHttp + MatchVale);
        }

        #endregion

        #region 替换通过正则获取字符串所带的正则首尾匹配字符串
        /**********************************
         * 函数名称:GetHref
         * 功能说明:匹配页面的链接
         * 参    数:HtmlCode:html源代码
         * 调用示例:
         *          GetRemoteObj o = new GetRemoteObj();
         *          string Url = @"http://www.baidu.com/";
         *          strion HtmlCode = o.GetRemoteHtmlCode(Url);
         *          string s = o.RegReplace(HtmlCode,"<title>","</title>");
         *          Response.Write(s);
         *          o.Dispose();
         * ********************************/
        /// <summary>
        /// 替换通过正则获取字符串所带的正则首尾匹配字符串
        /// </summary>
        /// <param name="RegValue">要替换的值</param>
        /// <param name="regStart">正则匹配的首字符串</param>
        /// <param name="regEnd">正则匹配的尾字符串</param>
        /// <returns></returns>
        public static string RegReplace(string RegValue, string regStart, string regEnd)
        {
            string s = RegValue;
            if (RegValue != "" && RegValue != null)
            {
                if (regStart != "" && regStart != null)
                {
                    s = s.Replace(regStart, "");
                }
                if (regEnd != "" && regEnd != null)
                {
                    s = s.Replace(regEnd, "");
                }
            }
            return s;
        }

        /// <summary>
        /// 从标签中提取内容
        /// </summary>
        /// <param name="htmlcode"></param>
        /// <param name="filterCode">过滤代码 例【//div[@id='article']】</param>
        /// <returns></returns>
        public static string GetContentByTag(string htmlcode,string filterCode)
        {           

            HtmlDocument doc = new HtmlDocument();
            //  doc.Load(htmlcode);
            doc.LoadHtml(htmlcode);

            HtmlNode node = doc.DocumentNode.SelectSingleNode(filterCode);  //div[@id='article']
            if (node == null)
                return string.Empty;
            string content = node.InnerHtml;
         

            return content;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="htmlcode"></param>
        /// <param name="filterCode">过滤代码 例【//div[@class='article']】</param>
        /// <returns></returns>
        public static List<string> GetListByTag(string htmlcode, string filterCode)
        {

            HtmlDocument doc = new HtmlDocument();
            //  doc.Load(htmlcode);
            doc.LoadHtml(htmlcode);
            var list = doc.DocumentNode.SelectNodes(filterCode)
                              .Select(p => p.InnerText)
                              .ToList();

            return list;
        }

        /// <summary>
        /// 从标签中提取内容List
        /// </summary>
        /// <param name="htmlcode"></param>
        /// <param name="filterCode">过滤代码 例【//a[@href"]】</param>
        /// <returns></returns>
        public static List<string> GetLinkFindBy(string htmlcode, string filterCode)
        {
            HtmlDocument doc = new HtmlDocument();
            //  doc.Load(htmlcode);
            doc.LoadHtml(htmlcode);
            List<string> list = new List<string>();
            foreach (HtmlNode link in doc.DocumentNode.SelectNodes(filterCode))
            {
                HtmlAttribute att = link.Attributes["href"];
                //att.Value = "http://www.google.com";
                list.Add(att.Value.Trim().ToLower());

            }        

            return list;
        }

        public static string GetMetaContent(string htmlcode, string filterCode)
        {

            HtmlDocument doc = new HtmlDocument();
            //  doc.Load(htmlcode);
            doc.LoadHtml(htmlcode);

            HtmlNode node = doc.DocumentNode.SelectSingleNode(filterCode);  //div[@id='article']
            if (node == null)
                return string.Empty;

            HtmlAttribute att = node.Attributes["content"];
            string content = att.Value;         

            return content;
        }


        #endregion


    }

    public struct LinkItem
    {
        public string Href;
        public string Text;
        public override string ToString()
        {
            return Href + "\n\t" + Text;
        }
    }
}

